Ishikawa

The Ishikawa diagram – also known as the fishbone diagram – is a tool for systematically identifying the causes of a problem (effect). The bones divide the causes into categories.

Objective
  • Method for error analysis
  • Illustrate relationships
  • Categorize causes
  • Make causes measurable
  • Reducing error costs
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Procedure:

The Ishikawa diagram is one of the seven most important quality tools. It was developed by the Japanese scientist Kaoru Ishikawa.

Example:
Two work perform an identical task on two machines. Machine A1 produces about 15% more than Machine A2. A team conducts an Ishikawa analysis.

It turns out that there are many causes. The supervisor immediately initiates initial actions, such as optimizing the operating manuals or implementing new training sessions.

Tips:
Ishikawa Diagramm - 1
  • All core causes should be physically measurable.
  • Avoid dead-end arguments (e.g., lack of time, no money, management decision).
  • Persistently ask for core causes (5 Whys).

With more than 4,000 projects and case studies, Alphadi is a leader in the field of Lean Six Sigma and Sales Process Engineering. We advise you holistically so that your goals are achieved sustainably and in the long term.

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